I am genuinely having trouble with this question, may any expert pls show me the steps and answer pls?

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a.about 4 b.about 8 c.about 40 d.about 21

How much orange juice do you need to make 2 servings of lemony orange slush?

Answer pls man im trying to get out of summer school